The gallbladder is a sac-like structure located under the right lobe of the liver. It is attached to the common bile duct via the cystic duct. The gallbladder can store bile when the bile is not needed, and can squeeze bile into the bile duct and intestine for digestion when a person eats larger meals or fatty foods.
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2

Distention:
A distended gallbladder without gallstones could be a normal variant or could be due to an obstruction in the biliary tract distally, however that would also cause other related symptoms.
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3

Could be normal:
Fasting can cause the gallbladder to be distended when examined by ultrasound. A stone too small to see at the gallbladder neck can do this as well as a stone in the common bile duct. Narrowing of the bile duct where it empties into the duodenum by stricture or tumor can do this as well as pancreatic cancer.
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4

Depends:
Your gallbladder will be distended when you are not eating. It fills with bile and then, when you eat, it empties. This is not a problem. It is normal physiology. The problem happens when your gb is obstructed by a stone or inflammation and cannot empty. This can lead to infection and severe pain, fevers, etc. If you have no stones on ultrasound you may need a hida to see how ur gb empties.
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5

A distended:
gallbladder is caused by a stone blocking the outlet. So, eating fatty foods at this time may cause more discomfort than you necessarily would want. I would suggest seeking a PCP opinion and possibly getting referred to a surgeon for removal. Good Luck
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7

Short answer:
Is: gallstones cause gallbladder attacks. Usually, a stone, which the gallbladder forms, gets stuck at its neck and causes a blockage against bile emptying. The neck is where the gallbladder narrows down to form the cystic duct, which in turn joins the common duct. When the gallbladder contracts against the obstruction caused by stone in the neck, it causes pain, which is the attack.
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9

No one really knows:
The majority of patients that develop complications related to gallbladder disease have assoc gallstones. No one knows why some people develop stones while others don't, although there are factors that increase the risk:family hx, female(esp, if fertile, forty, fair , fat), blood diseases(sickle cell, spherocytosis, hemolytic anemia), gastric bypass/weight change.A greasy diet can stim an attack.
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10

It's empty:
The gallbladder largely functions as a bag that concentrates bile made in the liver. Between meals, bile flows from the liver into the bile duct, and it is "sucked" into the gallbladder where it is concentrated between 8-20 x. When you eat, various stimuli including cck release stimulate gallbladder contaction, and the concentrated bile is then emptied into the small intestine to mix with food.
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Sac like organ that serves to store bile, a digestive detergent which is made in the liver. Typically contracts after eating and sends the stored bile down ducts to empty into small intestine.
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